How many people will die to protect Red?
It's not easy being a criminal. It would be naive to think that Red hasn't screwed over some very dangerous people throughout his years on the Most Wanted List. Though, up until now, he's come across as omnipotent in his knowledge and ability to assist in various FBI cases and doing it without suffering the wrath of the criminals he's used.
On The Blacklist Season 1 Episode 9, Red's past came back in the form of a disgruntled, Anslo Garrick, who certainly had a reason to go after Red. However, it's probable that Anslo deserved the bullet to the head.